Journal
CHEMOSENSORS
Volume 9, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/chemosensors9080190
Keywords
Bi2S3; reduced graphene oxide; ascorbic acid; electrochemical sensor
Funding
- National Natural Science Foundation of China [U1764254, 21911530255]
- 111 Project, China [D17003]
- Open Research Fund of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (Jilin University) [2021-03]
- Belgian Fund for Scientific Research under the FRFC [CDR J001019]
- National Funds for Scientific Research (FRS-FNRS, Belgium)
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An efficient electrochemical sensor based on a bismuth sulfide/reduced graphene oxide composite for detecting ascorbic acid was reported. The sensor showed enhanced electrochemical performance compared to a bare glassy carbon electrode, with a wide detection range, low detection limit, good sensitivity, and sufficient recovery values for accurate detection of ascorbic acid.
The engineering of an efficient electrochemical sensor based on a bismuth sulfide/reduced graphene oxide (Bi2S3/rGO) composite to detect ascorbic acid (AA) is reported. The Bi2S3 nanorods/ rGO composite was synthesized using a facile hydrothermal method. By varying the amount of graphene oxide (GO) added to the synthesis, the morphology and size of Bi2S3 nanorods anchored on the surface of rGO can be tuned. Compared to a bare glassy carbon electrode (GCE), the GCE modified with Bi2S3/rGO composite presented enhanced electrochemical performance, which was attributed to the optimal electron transport between the rGO support and the loaded Bi2S3 as well as to an increase in the number of active catalytic sites. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis of Bi2S3/rGO/GCE demonstrate that the active Bi2S3/rGO layer on GCE plays an important role in the electrochemical behavior of the sensor. In particular, the Bi2S3/rGO/GCE sensor shows a wide detecting range (5.0-1200 mu M), low detection limit (2.9 mu M), good sensitivity (268.8 mu A mM(-1) cm(-2)), and sufficient recovery values (97.1-101.6%) for the detection of ascorbic acid.
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